When you save a clip to lineup you will see a “Tag when shared” checkbox. When this box is checked, when you share that clip, your user name and image will appear at the top of the video. 

In most cases it tagging is the better option, but is certain cases, like if you are a videographer uploading content for a client, you may not want your name to appear at the top of the clip.

When you view your own clips they will not be tagged.